/*
* author: www.somethingwhat.com
*/
var cat = window.cat || {};
cat.touchjs = {
  left: 0,
  top: 0,
  scaleVal: 1,    //缩放
  rotateVal: 0,   //旋转
  curStatus: 0,   //记录当前手势的状态, 0:拖动, 1:缩放, 2:旋转
  //初始化
  init: function ($targetObj, callback) {
    touch.on($targetObj, 'touchstart', function (ev) {
      cat.touchjs.curStatus = 0;
      ev.preventDefault();//阻止默认事件
    });
    if (!window.localStorage.cat_touchjs_data)
      callback(0, 0, 1, 0);
    else {
      var jsonObj = JSON.parse(window.localStorage.cat_touchjs_data);
      cat.touchjs.left = parseFloat(jsonObj.left), cat.touchjs.top = parseFloat(jsonObj.top), cat.touchjs.scaleVal = parseFloat(jsonObj.scale), cat.touchjs.rotateVal = parseFloat(jsonObj.rotate);
      callback(cat.touchjs.left, cat.touchjs.top, cat.touchjs.scaleVal, cat.touchjs.rotateVal);
    }
  },
  //拖动
  drag: function ($targetObj, callback) {
    touch.on($targetObj, 'drag', function (ev) {
      $targetObj.css("left", cat.touchjs.left + ev.x).css("top", cat.touchjs.top + ev.y);
    });
    touch.on($targetObj, 'dragend', function (ev) {
      cat.touchjs.left = cat.touchjs.left + ev.x;
      cat.touchjs.top = cat.touchjs.top + ev.y;
      callback(cat.touchjs.left, cat.touchjs.top);
    });
  },
  //缩放
  scale: function ($targetObj, callback) {
    var initialScale = cat.touchjs.scaleVal || 1;
    var currentScale;
    touch.on($targetObj, 'pinch', function (ev) {
      if (cat.touchjs.curStatus == 2) {
        return;
      }
      cat.touchjs.curStatus = 1;
      currentScale = ev.scale - 1;
      currentScale = initialScale + currentScale;
      cat.touchjs.scaleVal = currentScale;
      var transformStyle = 'scale(' + cat.touchjs.scaleVal + ') rotate(' + cat.touchjs.rotateVal + 'deg)';
      $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle);
      callback(cat.touchjs.scaleVal);
    });

    touch.on($targetObj, 'pinchend', function (ev) {
      if (cat.touchjs.curStatus == 2) {
        return;
      }
      initialScale = currentScale;
      cat.touchjs.scaleVal = currentScale;
      callback(cat.touchjs.scaleVal);
    });
  },
  //旋转
  rotate: function ($targetObj, callback) {
    var angle = cat.touchjs.rotateVal || 0;
    touch.on($targetObj, 'rotate', function (ev) {
      if (cat.touchjs.curStatus == 1) {
        return;
      }
      cat.touchjs.curStatus = 2;
      var totalAngle = angle + ev.rotation;
      if (ev.fingerStatus === 'end') {
        angle = angle + ev.rotation;
      }
      cat.touchjs.rotateVal = totalAngle;
      var transformStyle = 'scale(' + cat.touchjs.scaleVal + ') rotate(' + cat.touchjs.rotateVal + 'deg)';
      $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle);
      $targetObj.attr('data-rotate', cat.touchjs.rotateVal);
      callback(cat.touchjs.rotateVal);
    });
  }
};
